A076146 a(1) = 1; a(n) = a(n-1)*prime(a(n-1)).

1, 2, 6, 78, 30966, 11234495766, 3197149582479668022558

Offset

1,2

Comments

Previous term * prime(previous term). Previous term + prime(previous term) is A074271.

Matula-Goebel numbers of the finite ordinal numbers; see also A007097. - Gus Wiseman, Aug 30 2016

Links

Table of n, a(n) for n=1..7.

Mathematica

NestList[# Prime@ # &, 1, 6] (* Michael De Vlieger, Aug 30 2016 *)

Crossrefs

Cf. A033286, A074271, A007097, A000040, A004111, A348067.

Sequence in context: A231508 A136306 A274825 * A114552 A302343 A244084

Adjacent sequences: A076143 A076144 A076145 * A076147 A076148 A076149

Keyword

nonn,hard,more

Author

Zak Seidov, Nov 02 2002

Extensions

a(7) from Gus Wiseman, Aug 30 2016

Status

approved